IN THIS PROPOSAL A RESEARCH PROGRAM IS DESCRIBED FOR DETERMINING THE FEASIBILITY OF USING INTERFEROMETRIC TECHNIQUES FOR DETERMINING ATTITUDE AND ATTITUDE RATE OF A MISSILE WITH RESPECT TO AIRCRAFT. PERFORMANCE OF DIFFERENT INTERFEROMETRIC TECHNIQUES ARE EVALUATED FOR BOTH RF AND OPTICAL SYSTEMS. A SIMULATOR WILL BE DEVELOPED TO SUPPORT ANALYSIS, IMPLEMENTATION AND TEST EFFORTS. THIS SIMULATOR WILL PROVIDE A PRECISE REPRESENTATION OF THE TRANSMITTER AND RECEIVER ERRORS, AND MOTION OF MISSILE. COVARIANCE ANALYSES WILL BE THE MAJOR STUDY TOOL.